At the top of the MS Word document in the BI Publisher add-in is a menu marked 'Preview'.

This I thought would be useful, since it might give an idea of how a report will look once generated.

However if I click on any of the options I get an error:

oracle.xdo.XDOException: oracle.xdo.XDOException: java.lang.reflect.InvocationTargetException
at oracle.xdo.template.fo.util.FOUtility.generateFO(FOUtility.java:285)
at oracle.xdo.template.FOProcessor.createFO(FOProcessor.java:1972)
at oracle.xdo.template.FOProcessor.generate(FOProcessor.java:1116)
at RTF2PDF.runRTFto(RTF2PDF.java:643)
at RTF2PDF.runXDO(RTF2PDF.java:445)
at RTF2PDF.main(RTF2PDF.java:295)
Caused by: oracle.xdo.XDOException: java.lang.reflect.InvocationTargetException
at oracle.xdo.template.fo.util.FOUtility.generateFO(FOUtility.java:1199)
at oracle.xdo.template.fo.util.FOUtility.generateFO(FOUtility.java:275)
... 5 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at oracle.xdo.common.xml.XSLT10gR1.invokeProcessXSL(XSLT10gR1.java:916)
at oracle.xdo.common.xml.XSLT10gR1.transform(XSLT10gR1.java:608)
at oracle.xdo.common.xml.XSLT10gR1.transform(XSLT10gR1.java:326)
at oracle.xdo.common.xml.XSLTWrapper.transform(XSLTWrapper.java:187)
at oracle.xdo.template.fo.util.FOUtility.generateFO(FOUtility.java:1175)
... 6 more
Caused by: oracle.xdo11g.xpath.XPathException: Extension function error: Class not found 'com.siebel.xmlpublisher.reports.XSLFunctions'
at oracle.xdo11g.xslt.XSLStylesheet.flushErrors(XSLStylesheet.java:1850)
at oracle.xdo11g.xslt.XSLStylesheet.execute(XSLStylesheet.java:616)
at oracle.xdo11g.xslt.XSLStylesheet.execute(XSLStylesheet.java:551)
at oracle.xdo11g.xslt.XSLProcessor.processXSL(XSLProcessor.java:341)
at oracle.xdo11g.xslt.XSLProcessor.processXSL(XSLProcessor.java:189)
at oracle.xdo11g.xslt.XSLProcessor.processXSL(XSLProcessor.java:226)
at oracle.xdo11g.parser.v2.XSLProcessor.processXSL(XSLProcessor.java:122)
... 15 more

Is there a way to avoid this error and instead see a preview of how the report will look?

In case some else has the same difficulty:
1) If you have access to MOS then its this document:
Reports fail with error Extension function error: Class not found 'com.siebel.xmlpublisher.reports.XSLFunctions' in 8.1.1.7FP [ID 1468197.1]